Simple Speaker Protection for Power Amplifier with Balanced Outputs - diyAudio
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Old 14th October 2013, 04:18 PM   #1
EUVL is offline EUVL  Europe
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Default Simple Speaker Protection for Power Amplifier with Balanced Outputs

There are literally hundreds of circuits on the net for speaker protection, so we thought we wanted to add one as well.

http://xen-audio.com/documents/f5x/X...c%20131003.pdf

Disclamer :

We try our best to be error free. And the circuit has been proven many times.
But until someone actually double check the schematic, we do not guarantee 100% no drawing error.




Patrick
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Old 15th October 2013, 01:14 AM   #2
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cool, thanks
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Old 5th May 2014, 04:57 AM   #3
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There is a 2nd (improved) version using NJFET as input devices.
I have no time right now to test build, but I'll see if I can publish in the near future.
This version also has a PCB design to go with, which is however not yet verified.


Patrick
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Old 6th May 2014, 01:45 PM   #4
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As promised the article for Version 2 circuit.

http://www.xen-audio.com/documents/S...a%20140506.pdf


Patrick
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Old 7th May 2014, 01:52 PM   #5
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Referring to questions posted by an Aleph X builder :

Aleph-X builder's thread.

If you are interested to alpha test the PCB for us, please send a email to me and I shall get you in touch with those who can take care of it for you.
You only need to pay postage & packing, since it is alpha test and I have right now no time to nurse you through.

I also have no time to write a proper assembly instruction in the next 2 months.
But I shall try to put together a basic BoM for you.
Component placement should be clear on the PCB. If not, please ask here.

The junctions of c1/r7 and c2/r8 are connected to amplifier ground.
It is good practice that they have a ground reference, though in theory you could leave it floating.
The power supply for the protection board is +/-15V after the on-board 7815 / 7915 regulators.
I presume you can handle the rest (Tx with 2 secondaries, 2x bridge rectifier).
Connection from PSU to protection board is +Vs, Gnd, -Vs.
Protection board Gnd can be connected to amplifier Gnd via a 10R 2W resistor if you wish to have some isolation.


Hope it is clear,
Patrick
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Last edited by EUVL; 7th May 2014 at 01:54 PM.
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Old 7th May 2014, 02:19 PM   #6
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Thanks for this. I will give it a go.
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Old 7th May 2014, 02:47 PM   #7
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As an excception (due to lack of support from me), I attached herewith a Spice file of the circuit.
Those skilled DIYers would be able to change things in simulation for fine adjustment to theri needs before building.


Patrick
Attached Files
File Type: asc XEN SSP V2.asc (9.0 KB, 57 views)
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Old 7th May 2014, 03:41 PM   #8
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Very considerate. THank you.
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Old 11th May 2014, 07:40 AM   #9
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Buzzforb,

I trust that you are skilled enough to do this without any input from me.
If you would help to verify the prototype PCB, please send MarkLai a email.
He will send you, and Jason, each a proto PCB for test at our cost when it is ready.
It might take a few weeks. Ans you only need to pay postage.

I'll prepare a preliminary BoM and post it before then.


Patrick
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Old 11th May 2014, 09:59 AM   #10
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Will do.
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